Only call setFullScreen if that changes fullscreen state

lib/features/home/home_page.dart

@@ -48,7 +48,9 @@ class _HomePageState extends State<HomePage> with RouteAware {
     super.initState();
 
     // Exit fullscreen when entering home page
+    if (FullScreen.isFullScreen) {
       FullScreen.setFullScreen(false);
+    }
 
     // Subscribe to route changes
     WidgetsBinding.instance.addPostFrameCallback((_) {
@@ -71,14 +73,19 @@ class _HomePageState extends State<HomePage> with RouteAware {
 
   @override
   void didPush() {
+    // Exit fullscreen when entering home page
+    if (FullScreen.isFullScreen) {
       FullScreen.setFullScreen(false);
+    }
     super.didPush();
   }
 
   @override
   void didPopNext() {
     // Exit fullscreen when returning to home page
+    if (FullScreen.isFullScreen) {
       FullScreen.setFullScreen(false);
+    }
     super.didPopNext();
   }
 

lib/features/sheet_viewer/sheet_viewer_page.dart

@@ -65,7 +65,9 @@ class _SheetViewerPageState extends State<SheetViewerPage>
     _rightDrawingController = DrawingController(maxHistorySteps: 50);
 
     FullScreen.addListener(this);
+    if (FullScreen.isFullScreen != widget.config.fullscreen) {
       FullScreen.setFullScreen(widget.config.fullscreen);
+    }
     _documentLoaded = _loadPdf();
   }
 
@@ -161,14 +163,12 @@ class _SheetViewerPageState extends State<SheetViewerPage>
       );
 
       // Upload left page to server
-      if (leftHasContent) {
       _syncService.uploadAnnotation(
         sheetUuid: widget.sheet.uuid,
         page: _currentPage,
         annotationsJson: leftJson,
         lastModified: now,
       );
-      }
 
       _leftDrawingController.markSaved();
     }
@@ -188,14 +188,12 @@ class _SheetViewerPageState extends State<SheetViewerPage>
       );
 
       // Upload right page to server
-      if (rightHasContent) {
       _syncService.uploadAnnotation(
         sheetUuid: widget.sheet.uuid,
         page: _currentPage + 1,
         annotationsJson: rightJson,
         lastModified: now,
       );
-      }
 
       _rightDrawingController.markSaved();
     }
@@ -214,7 +212,7 @@ class _SheetViewerPageState extends State<SheetViewerPage>
   }
 
   void _toggleFullscreen() {
-    FullScreen.setFullScreen(!widget.config.fullscreen);
+    FullScreen.setFullScreen(!FullScreen.isFullScreen);
   }
 
   // ---------------------------------------------------------------------------
@@ -300,8 +298,9 @@ class _SheetViewerPageState extends State<SheetViewerPage>
           icon: Icon(
             widget.config.fullscreen ? Icons.fullscreen_exit : Icons.fullscreen,
           ),
-          tooltip:
+          tooltip: widget.config.fullscreen
-              widget.config.fullscreen ? 'Exit Fullscreen' : 'Enter Fullscreen',
+              ? 'Exit Fullscreen'
+              : 'Enter Fullscreen',
           onPressed: _toggleFullscreen,
         ),
         IconButton(
@@ -313,8 +312,9 @@ class _SheetViewerPageState extends State<SheetViewerPage>
           icon: Icon(
             widget.config.twoPageMode ? Icons.filter_1 : Icons.filter_2,
           ),
-          tooltip:
+          tooltip: widget.config.twoPageMode
-              widget.config.twoPageMode ? 'Single Page Mode' : 'Two Page Mode',
+              ? 'Single Page Mode'
+              : 'Two Page Mode',
           onPressed: _toggleTwoPageMode,
         ),
       ],
@@ -346,8 +346,9 @@ class _SheetViewerPageState extends State<SheetViewerPage>
       currentPageNumber: _currentPage,
       config: widget.config,
       leftDrawingController: _leftDrawingController,
-      rightDrawingController:
+      rightDrawingController: widget.config.twoPageMode
-          widget.config.twoPageMode ? _rightDrawingController : null,
+          ? _rightDrawingController
+          : null,
       drawingEnabled: _isPaintMode,
     );